clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Add test: `UUIDv7ToDateTime` non-v7 fallback returning epoch is untested
- Fix DISTINCT silently dropped through UNION ALL CTE in RemoveUnusedProjectionColumnsPass
- Add test: `Path::hasGlobsIgnorePlaceholders` early-return branch (no placeholder, raw globs) untested
- Fix CHECK TABLE re-fetch loop on parts with unknown-projection orphan checksum entries
- Improve canceling queries with url() function
- UNIQUE KEY: DDL, metadata, and policy gates (1/N)
- Make query_plan_use_logical_join_step setting obsolete
- Replace PREWHERE in timeSeriesSelector
- Simplify initializing prometheus services in tests
- `isNumber(removeNullable(type))` in `PrettyBlockOutputFormat` does not strip `LowCardinality`, so `LowCardinality(numeric)` columns skip digit-group highlighting while plain or `Nullable` numeric columns are highlighted
- Docs
- C++ not yet supported